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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62596ac31b012d0085c9ddca5e064945a2d299c8e5ece20efed65c8600a5b9e8' 
  AND token = '4xa6XZ13QbunFARJ65U20RqFpqOnJ2JSW3CsOVRA1Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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