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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3e76352a9e5ec4094333b0f39e23ffc42942817e7e9bd5977361d9585e31ab' 
  AND token = 'xIKBuGGrvLyp+xfQOruQZzdV2itmLksgflX63clxKZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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