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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ab2d54f85d5e8c7895c007ab75d2de7cdc5435b3b37ffee5171e34a8f22320' 
  AND token = 'VJIJZh1MWPccuEJr4fkhA1Bf8hdxFLlxOlOODb7xc5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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