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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe0ddef66958ad7e69ae5a38fdea7f7950988ec2f87906c7a98d676f77f29a0' 
  AND token = 'mWz7r+ZxL5376Dv5ao2VOupCgyK7iOphkniKDP9sVVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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