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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2aa8500261199a53f0bbe2789277062ff7d5c4d3af9c0b044f57e2e1cc6d01' 
  AND token = 'oYHL17dkoJNECSz1NBjtoyOV2BlcU1lCJVcfCIL818w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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