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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28d0c869a482c93924f62b7f7ad00ad896b86acdbe928d5d9babaaa5bc793e9' 
  AND token = 'b+QuH0MGsWP0zVLB1iCabW88x1yOCWBOBXVn+4VGWtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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