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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6a14a0566b29ddd75dac12aa06a5aa6187eec8c1c3f96e5b159acc178aded0' 
  AND token = '8QO6IiF5elF0itr3Q5CiSQzpnXtHCingko6yeXD716w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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