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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9148286c7c0d48f26f09a53fe4859d05562b3d4dbe5fd1dc01112b4c23df2f' 
  AND token = 'zMlSp0q0j6M+lHfbmnH6vARS55pnyyYpSmd5H+6AN+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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