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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53d41dc167c560441bccd4e0691e294172a3cc8e43a0a73c4c1cc025e3ed93c' 
  AND token = 'nnn3epvfIbKusrXTFWwUEnYx2yhj0KDnS6T+zbajaLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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