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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10012ae8f74c10b2e4b9d583157800d26fb74b2fdcd5f95372e1037787c3fb6' 
  AND token = 'KAVL7xU9DMld3apFNa7UEn/i64yDywxLFXkcoTY3D+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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