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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16cc79b016e0c8490759505d4cab47ae114f1ed158428e7fb7415193842617e' 
  AND token = 'H3OTS82a3xeE87sIsv6QY1bw+TkGGL0+Ne4bbq0y8zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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