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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200fc8b3589cf712246a0e1feca4cabca02a0d93ff752ffc5a2e4fd7d069fdb8' 
  AND token = 'BJBTbvFUauTPNnAHwWPDDL4VDCxSNH3+APDVvPTbp4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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