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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901bd5da4b94a66e2d1b4cf74d1bea823e19d4f550918e7c5531c8607fa15e08' 
  AND token = 'Ms8M36ue8ZUQcgD71/bxl5qBdwfN1A7og4W43F92mEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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