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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9066716a80bb317a6002de6a92ee66a0027e233edfc9eef5dda3211a7b773a' 
  AND token = 'EdbAevU5J8hw8Tu0j7+eo7rLbkDPncgCp54f3JUQzg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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