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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a712296478bda97f65ca4d812bc273c49d4e22b3eb32b3fb40e87e363b465d2' 
  AND token = 'ay1sqfoJsZl0HFoRxJwc/xGX/0HFjvyE148A62K2ODo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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