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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23a99f8d556b240e87588c6230e9ef3608d1b567acc31077f226b4738203eb9' 
  AND token = 'p5yR/H5wRbFQ4263dodEz3+JvCELcUTFtOKUyh+2Iow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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