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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4d5c1c343817cbb8c5a4fd8342b323dc7b7a73c7bb11dd4d56d5bb9ef3bc82' 
  AND token = 'LntKkGptAyIOBx4Wb6Fhz4ji07YywSQw23K69imQKzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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