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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a0e99ff3d24f6529be0154dceeb8e684354105ae71a780ce893d2e2a984c5e' 
  AND token = 'DIVGrmbgm/+XuFNm54l67fRgrzLHXaJ8tgg9ISIMgVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00575

JSON explain

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