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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14819ba8d97cfd4f70058ee721599c707e1be7b9da5fd6c62ce69729b0555e8c' 
  AND token = 'oZ2fpA4ehgGQXYBBg7QA/oMtXg+ooXDMWQbpwAIZ92o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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