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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1861143fc45f672fd807ec8ad55b666c487ce5d8d3d512b7bfd30042ceba12d' 
  AND token = 'sk4dumRo50u4r1QkMvcx5IrbR0Esgxd1SrZmTTthvMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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