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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bab46fcae80292ece0ec038c88d775cf3fae3a3ffaf4342550ee6c2b35c02b' 
  AND token = 'NgiX/ImJyl6eYQKMIzB9VcVkrsS/07W/I4ArVvJ6zwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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