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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f47a7a52f775a31712c5b19216bd97e3e189e8a0ba1bb5655c80b1136a49a9' 
  AND token = 'r4ubSbRtKbbFA0BbJquEzUYJXl/jHhRKHMJazUD6hOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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