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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3601a040830e3e0324eef0782a1f338cbe3c6716ebbb0d72937d3a6071982802' 
  AND token = 'SHF+RAreZ+TeMcJD6WmK2zssKF0THoM3AWb6aS6oT/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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