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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e317b24c36abb499460fb0b1d50e8899e68a192c0074032d2b4268ee72d5a397' 
  AND token = 'my6cvelEHW2oiQPX3iynaE9B3izxntki/Shfu7/VnYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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