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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d56772d3f195c98bf5401019b352be985d1ca9c92b81f39cf7d5a12c839141' 
  AND token = 'aM6iKANW4Lks9PbNefn2S7mFxClP6XZoCFZoiQ7UZSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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