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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2eb08e062f4ec9df7fe88866ad8d5ff9d12f3072c5fa4a042d063d6a159f2c' 
  AND token = 'fNa0R+gLvAw3XPMOOFuzJJX1a8iXA3UXJzrhX+PIUsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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