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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba50f23d91e75592ec1e58336932ecb0413d7b247e49469c3532522085a0979' 
  AND token = 'DkyihFHlv/zN3I4flb9Npv4b8LtX+SQ6HcP0bACy0gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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