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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d96d5f4be871a4e98ee43741cd57322d53816e87ff1ec4d15d852d63ed58c03' 
  AND token = 'ManOCJLRG4it2vvRG3nsa8O33C9jLvrt+bjkVaYCUDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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