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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347dc8aea51d1b2985e80468c779bda275b6e10062bdf71b56aebe6d56cf561e' 
  AND token = 'wbCPYeT/a+rPykF+5+erKji50TT1v35J3DQ2iMc4kHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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