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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfb2386df1f5fc102b941ed67494fb1b7c353864ae32287d94fcbf52b240a51' 
  AND token = 'VOe/QUrsLmIta/SR8paU5k6F3NEu8N/N0wePAeArwfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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