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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3daea9454c9db599c8b8ad15cd393c764b1fb6090276e102d1f9625887338be1' 
  AND token = 'XlrdskcWEItlNtdRyx0q0u4oTo+AD8kif4bjkoJhHeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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