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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcb6ca3e8ed1f3b639bfb8991dc2c3c7014a569d807c47fe51a591c32c1ba31' 
  AND token = 'sg4qSjOBL7IbVGftueuyfm7CKnZA1pjCXB6PX6j1I7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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