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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ad303c7f99678d89030fa26ff2f582c9e86d27696796a72290f72f38d33d87' 
  AND token = '7UJa12gm6VObnsOPw+ysAnGMNyJ4M33LDPbrdp16r64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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