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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f66c07863b4fe9411f0bb870b9f3c3b63a83fbfcdcc0b3ddc427294e5629f3' 
  AND token = 'w/x4het8pkUP2FBYhy2HH4l0n8vUXOP9smoYnCadRDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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