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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf670cd00322c015f28e098043a1a9b23bb7862c5728754b20ca004fbead5342' 
  AND token = '6hktC2l75ToNEwfWm4hmbaUPkI1eSpeJHkJGfIHGHxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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