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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b98e8558f12bf00ae2a34a54abe3c3b37fb655173d371cb4e53e4de33e4f17c' 
  AND token = 'V1GqV4rjMK+yXjsMg7oTgGMOD51FkrdDe+AFS7X7WpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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