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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c855cad891388df69294fc24353743d176921f92b175c94bd5fcb73bc5d7aa81' 
  AND token = 'mgdUSpXjyg63fmMbTq1z9pgO+RQm8QQTjHuK3RTunMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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