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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bcd9624b7765bfe7f3811d366ca5dd9dbd3de13436d9ec95f58635debc0145' 
  AND token = 'x5afra+Rbd+OpY3UjqqnrleGKBJ3Gjo2CwYA6IGDDfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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