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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21708280e7481b6149b310c16692152885aa7b74d58286e40aae287b5936a64' 
  AND token = 'iV+2v5Q2fKwg/Vuom8/ZEB84BsyaX7vTu578wcuLlqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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