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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ae6f8d8ca11a9076c5e4b67556916b10065eec53ff2658a14ee4efb630fac7' 
  AND token = 'WzgoVkKT/GsLxQ8n5qnCttYnncWmTlUOGYPsS814yuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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