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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63771787a0c4563686f4a35181aa192f50f13a99138c955b736660bb0fa5db6b' 
  AND token = 'T6b3Ry4Jw5+dw3wol9Bf1cO2IvUAoc5I3q4oI8ZHA+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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