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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a31475d05fb170a66c9f3e5049c6fa5673722d8f19000df40fa81ab05e1852' 
  AND token = 'KC6yTlV8B8aHxfFoKHHGvGK4czM2quzH9CEZHQ4v2VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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