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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c3bd424bef2c83f5c97107ec7d33ace62e6afb74f170338ca6863c5e702832' 
  AND token = 'NTA4xSBe32kMWe9kQq1b+zRUIxocWApgKHxwFr44Z4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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