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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77447b4389241130e75641013726aeb490d1e8af3b1e07a734d8f97b4106fc25' 
  AND token = 'SVroSnQrBmwwf+nHZ7kGU+j3ufa2MrYVFLoCBLYD4Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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