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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67152f4a4ab59c017d2d35587abc7b847467aa3f83ae7f834bef4b095e64dba9' 
  AND token = 'cbI0Wcy4XC9d52hmP5RxsmUaY3g75vsikR01rXcdero=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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