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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5942df0024b64e6b8b796815a7d9d68776aa2d52443cf85ccb965f09a83b86b8' 
  AND token = 'OvoUbW74ZtO0tUrJpSwsaXM2EXHDZ47iXA3oS3LUawI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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