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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2fb7ce74a2b4b5678f48950f7ff5e44b3aabc55933748a0a3253e5b709b53c' 
  AND token = 'a0tbpYfEPzvxL8CZ7leMVFXnZTfwpuJxAg7RQ2w1RgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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