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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3bca9bad0d6f4a6a7de38f208292316dc845cdd7069c0be1e9ce995ef65203' 
  AND token = 'R8b4ROE2GNCaP1UYJuSzyxVzbO9Lgcn6++X7IvAgS3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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