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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c351eab5d7bd6aa43e268b77e69bd50ac2b22e19b996c281f4d41e4bbe8537' 
  AND token = 'iVcRbanRnhrn2iTutM5I0fsek76x+XAP3jaRLxycWYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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