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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07dd9115586d0e8f9c5ea98015724bc2bfeaa224edabbc01b2a56aba12d30d6' 
  AND token = 'mHWNjPV/dTkhX8ccBzP3rhVSAH5TT6hb0toKH5XGZqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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