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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e539fe9be1e99670547c8e31e63c23bc8b039f7b1851971bdad2aa82c4c7f9' 
  AND token = '7eJhgcdfNHcNWlqq+/3cliXAIvAPlMp4YjRmnPjdUeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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