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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423f4795b7ec441287695943ac6d1e0175085a082bd4e2e15efaa4481ff01781' 
  AND token = '8795MGhKKytZKtRJQiL3mVRdRf5LdZoOjn+sNSr7xN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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