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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7aee3c73a1c6200aface77e229d8c46175926984d1f8b526d1d3a8381386c2b' 
  AND token = 'I2lGFzOVC81/+aK+MEb4BQsdysptijFMK9gR8eyEvqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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