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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925c32630f9012985a0ce3f6f89b8865357c03dfeacd62bc80c7563af244f1ab' 
  AND token = 'muhxAYio7Zdg2vYh0m6M7hcrB9bd/VitYXobf2WFTh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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