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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fdba10a99a1bcadb1e3908da5e38fdeebdb3a5e7846c77f3676d5d75de69e8' 
  AND token = '79xt+ul/AvO8B45wRd66muYVtC48GLmPkk0SX/9vB7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}