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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647f470c1c38a83f30ae8fd12a45ca400c9ad210351a1d3da7f01af44a1b3959' 
  AND token = '0Oar4roNmnssVQt/SaNVG2Tl/3m2WBaGPds5OE/PupA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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