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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956c50e6701334cff72fe6ba8663c709a9941fffe00313f2369627e574931fd7' 
  AND token = '02yjTGudKbYLMYsq9voyO/vmzlm2dQJeztOS9udF9mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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