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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31ffec88ea5d2e57ae0aaf6ca9de91e8995f41d9806d00d1dac60e0ed07d150' 
  AND token = 'fyWu4Mnk8/I2VLzi6mTuKaTh6+VLCeOWnAhMYPvdtdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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