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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe9c1f898e2e19958a887b27567ac69a8527f9f617f0c838dd59fddb37ccfbd' 
  AND token = 'KSU5DApgdSl0p6cxxT8Q3Kp3o9bolgS5/pNkzUdWwdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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