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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7937cd37bee905d8c83f888e6c1895529ca2ec69788667814dffafbb5497a0f8' 
  AND token = 'fRRxDq0yRUSNS/dmcyek9cvt5nJ8KTOSYtpzgMcRsEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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