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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea08e0fbc7260d551f4e9f9bf212ce3f5893093cf2858534896f8a34162019c' 
  AND token = '5J1gSimpSMF7sJlDu5uX3lqQwf+6dSVS5lgzLcB81DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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