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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2276aaa68c9bb7e0cf93a87fd33f1d02dcc4c457fd355a03c73292f3655002' 
  AND token = 'FpVeJayr6GrLN/S353iKBZ3KifCEPRkbDRCnw0pPCbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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